By Greg Morris and Leighton Hart, Pioneer dairy specialists
Maize silage is a cornerstone feed source for many Australian dairy farms, producing large quantities of high-energy feed from a relatively small area.
While seasonal conditions influence crop performance, establishment is where much of a crop's yield potential is determined.
So, what can growers do to get their crop off to a good start?
Success starts with paddock selection.
Maize performs best on well-drained soils with good structure that allow rapid root growth and early crop development.
Compaction, waterlogging and weed pressure can all reduce yield potential before the crop has even emerged.
Soil testing is an essential tool for achieving high-yielding maize crops, which require significant amounts of nutrients, particularly nitrogen and potassium, but phosphorus, sulphur, magnesium and trace elements must also be available in adequate quantities to support strong growth.
Dairy effluent can provide a valuable source of nutrients and organic matter while helping recycle nutrients generated elsewhere on the farm. When applied strategically, effluent can contribute significant amounts of nutrients, reducing reliance on purchased fertilisers.
However, nutrient content can vary considerably between farms and storage systems.
Effluent testing is an important part of determining application rates and ensuring crop requirements are met without creating nutrient imbalances.
Careful management of application timing and soil conditions is also essential to maximise nutrient utilisation and minimise the risk of runoff or nutrient losses.
Uniform emergence is critical, making seedbed preparation an important step.
A firm, level seedbed with good soil-to-seed contact promotes even germination and crop development. Planting should begin once early morning soil temperatures at planting depth reach 10°C and are rising, helping ensure rapid establishment and a consistent plant stand across the paddock.
Research has shown that maize plants emerging more than three days after their neighbours can lose around 5 per cent of their yield potential for each additional day of delay.
Selecting the right hybrid is another important decision. The best silage hybrids combine high dry matter yield, strong grain production and good late-season plant health.
Grain contributes a large proportion of both the dry matter yield and energy content of maize silage, making hybrid choice particularly important.
Maturity should match the growing environment and harvest timing requirement of the farm.This is where a trusted agronomist can become one of the most valuable members of the team.
Having access to local expertise helps ensure the decisions made around hybrid selection, planting populations, fertiliser programs, irrigation scheduling and pest management are tailored to the paddock and season rather than relying on a one-size-fits-all approach.
Experienced agronomists can also identify potential issues early, helping prevent small problems becoming costly yield losses.
Plant populations must match the productivity of the paddock, while nitrogen applications should align with crop demand.
Water management is equally important, from the outset through grain fill. Regular crop monitoring is also essential.
Maize is a poor competitor against weeds during its early growth stages, while pests such as fall armyworm can affect plant population and crop uniformity if left unmanaged.
Maintaining healthy green leaf area through grain fill helps maximise both yield and digestibility.
High-yielding maize silage crops are ultimately built on attention to detail, sound planning and timely management from planting through to harvest.